The answer sits somewhere on the scales of human achievement. On one side: natural talent. On the other: hard work. Many would argue that success hangs in some delicate balance between them. But not Anders Ericsson.

When Susan Cain wrote Quiet: The Power of Introverts in a World That Can't Stop Talking in 2012, it was a big success. The book made the cover of Time magazine, spent weeks on the New York Times best-sellers list and was the subject of one of the most-watched TED Talks, with more than 13 million views.

When West Baltimore's Renaissance Academy High School hired four African-American mentors earlier this year, student Jalone Carroll wanted nothing to do with them. He figured they would come "mess everything up, and then dip," or disappear.

"We didn't know how to take that type, you feel me," says Carroll. "Somebody that cares, somebody that really wants to see us succeed."

We might not be able to remember every stressful episode of our childhood.

But the emotional upheaval we experience as kids — whether it's the loss of a loved one, the chronic stress of economic insecurity, or social interactions that leave us tearful or anxious — may have a lifelong impact on our health.

Amy Roegler and her husband, Octavio Herrera, live with their young kids, Jake and Alyssa, in Los Angeles. When it comes to pro baseball, they're all Dodgers fans. And Jake loved balls even as a baby, Octavio says.

"We have a picture of him as a 3-month-old with a little Dodger jersey and a glove," Octavio says. "So he was definitely going to be introduced to sports early, and he took to it right away." Today 10-year-old Jake is on his baseball league's All-Star team.